I think what can happen with threads like this is that there is always someone who will vehemently argue that none of the advice applies to them because they have xxxxx problem, and also yyyyy problem and then probably zzzzz problem...
Frankly, and I'll probably get shot down in flames for this, the % of women who are single parents (i.e. no partner to take charge for 20 mins while Mummy showers) of children who have severe enough special needs to be left alone is really small.
The VAST majority of women have partners who can do their bit. (someone will of course jump in and tell me they don't)
the VAST majority of women have children who sleep to around 7am ish (of course, someone will have a child who gets up before they go to bed etc)
The Majority of women who have a child who is not a newborn are not actually up all night - maybe once, but not up all night every night
The vast majority of women have children who can be left fot 10 minutes in a safe room with the doors open on a baby gym/bouncy seat/play pen/SOMETHING with cbeebies or a dvd on
Even if your baby cannot be left now, they will probably be able to be left in 2 weeks time...what I've seen happening is the "I can't leave him to watch the TV" meaning that this is then written off for the next 10 years - maybe you can't leave him this week, but maybe in 3 weeks time developmentally he'll have changed enough to allow you to do so...
The VAST majority of women, if they get up before their children (which they CAN do - we'd all prefer a nice warm bed, but its about priorities) can have a decent shower, wash their hair, dry their hair, put on make up and get dressed - and it takes just as long to put on nice clothes as scuzzy clothes.
Sometimes yes, you need to forego sitting down in a comatose state with that first cup of tea or whatever - because that can add half an hour onto how long it takes - you have to adapt - no-one has ever actually died of lack of "first cup of tea in the morning" - promise yourself you can have it while the children have their breakfast once you are up and running.
But I still contend that the vast majority of women can do it.
I have 2 children, a 2 year old and a (just) 5 year old, I have a Dh who works away all week in a different country, I get up at 6:45 every morning and I always have a shower, wash and blow dry my hair, do my make up and wear nice clothes. If either of my children are up before I'm finished at 7:25 they either sit in my bed and talk to me, or nip downstairs and watch 10 minutes of TV....I then can get them both dressed, and breakfasted, and then we are out to go to preschool at 8:25.